مدرس المادة
The transistor is a three-layer semiconductor device consisting of either two n- and one p-type layers of material or two p- and one n-type layers of material. The former is called an npn transistor, while the latter is called a pnp transistor. In Fig. below both biasing potentials have been applied to a pnp transistor, with the resulting majority- and minority-carrier flow indicated.
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